Sun Definition and 1000 Threads

I've been tinkering with a few diagrams in an attempt to illustrate the motion of the solar system in its journey around the Milky Way. I also wanted portray how the celestial, ecliptic and galactic coordinate systems are related to each other in a single picture. Note: in the Celestial, or...

People pay thousands of dollars to fly to sun spots every winter. Could we not create an artificial "sun" and have it warm and illuminate a local beach or resort property? Of course it would require a tremendous amount of energy. But I think about a big bon-fire, or house or industrial fire...

The sun's rotational period is 25 days at the equator. Given that the radius of the sun is 700,000 km, calculate the max velocity of approach or recession of the Sun's equator as viewed from Earth. Find the max change in wavelength of a spectral line due to the rotation and express it as a...

why Earth moves around sun forever and ever and ever. My attempt for answer: Earth wants to move in straight Line forever and ever and ever(as there is no ext. Force)but due to massive sun space get bends(according to GR) and moving Earth starts moves in circle(or not perfect circle) , as it...

I have been wondering about space time and how it works like satillites putting corrections in there clocks by a few nano seconds a day because of gravity or lack of it! But I have also wondered about the effects of being super close to the sun and time that we observe there looking back at...

I understand that the fusion of hydrogen to helium in our sun's core generates gamma rays. My question is how are these gamma rays transformed to the full spectrum of photons that we that we observe from earth?

Imagine thee planets interacting through gravity, mathematically how should they come and rotate in a same plane, like planets and sun?

I read the Jupiter is so big that it doesn't really orbit the sun. Is that true?

is it because lunar eclipse shows that sun is bigger than Earth and moon, and solar eclipse shows that sun is too far because moon's shadow on Earth is almost a point.

The sun we see has a measured surface temperature of 5800K. This is the temperature of the photosphere , a glowing layer of plasma radiating energy from the sun. But when there is a hole in this layer and we look deeper into the interior the temperature drops to 3800K. How can this possibly be...

I've been trying to make an estimate for the pressure of the sun's photosphere using some sort of hydrostatic equilibrium equation, but I can't seem to get one that even comes close to agreeing with observations. Does anyone know what the right formula is and what the right way to approach the...

Earth moves around the sun in an elliptical path. When it comes close to the sun it speeds up. When it goes far, it slows down. This is acceleration and deacceleration. Why don't we feel both of these? I have read about it but haven't got satisfactory explanation.

So this is kind of a crazy hypothetical, but what would happen if you surrounded the sun in an invulnerable, perfectly insulating sphere that prevents anything from leaving. I imagine that as the sun heats up, the rate of fusion increases and the life time of the sun decreases. But that's about...

I have read popular accounts about the future predictions (the far future--a billion or so years from now) for our sun, and they say that as the sun ages, it will begin to expand and get hotter, eventually making Earth too hot for life. Is there a simple explanation for why the sun, after being...

According to calculations, only 0.000000724654% of sunlight reach earth, and if we can only see an object if the light bounced off the object hits our retina in the eye, then how can we see the entire Sun through any means (telescope, etc.)?

on earth, we have the poles being very cold and mostly frozen, while the equator is very warm and humid. i would like to know specifically what causes this. i know it is partially because of their exposure to the sun, but i'd like to know some of the details and factors involved. i'd also like...

I live about 1/4 mile from the Interstate Highway. I am far enough away the traffic can not be heard until the sun is very low on the horizon. Every even for about 1 hour when the sun is very low it sounds like the interstate traffic is in my back yard. It is so loud it is just like standing...

Homework Statement A spacecraft is protected from the Sun’s radiation by a planar baffle whose size is much greater than that of the spacecraft itself. The baffle is aligned perpendicular to the direction of the Sun. Show that the equilibrium temperature of the baffle is...

I understand the difference between comets, asteroids, and meteoroids. I was just reading about asteroids recently, and it occurred to me that when I read anything about these three types of objects the implicit (and sometime explicit) assumption is that they only apply to things that orbit the...

Scientists have measured both the blackbody spectrum and also the atomic spectra of various elements in the Sun. How do they distinguish between the two and filter out the light from either one?

SO fun story, I'm working on a client server dealio! The flow of operations should be: Server listens on port 9999 Client connects to port 9999 Server tells Client to connect to new port # (to allow for more connections) Server launches a thread and listens on new port # Client disconnects...

So I have heard that the Earth is spinning away from the sun at a slow rate. Is this rate fast enough to negate global warming by a significant amount, or is it too insignificant to effect anything?

What would happen if the Sun collided with an exact copy of itself? I can't find any information online about this exact scenario. So what would happen to the Sun? What would happen to the Earth and the rest of the planets? Any information or help would be greatly appreciated. Thanks so much!

As far as I know, the Earth orbits around the Sun because of the centripetal force , and as far as I know, friction and gravitation from other planets should affect the circular motion of the Earth and so the path of the Earth should not be necessary that perfect. In addition, there must be...

I was thinking about adding another page to my website concerning the nearest stars, the brightest stars, etc. In a list of the nearest stars, the vast majority are brighter than the Sun. (I looked for stars with an absolute magnitude that was greater than the Sun's (4.85) and had a visual...

why was Earth considered to revolve around the sun and nt the other way round? why is it wrong to analyze planetary motion from Earth frame?

Homework Statement What fraction of its "year" (i.e. the period of its orbit) does a planet spend traversing the half of its orbit closest to the sun? Give the answer in terms of the eccentricity ε of the planet's orbit. This is problem 15 from page 852 of Adam's Calculus 3ed. No detailed...

How, exactly, is the moon able to orbit the Earth while at the same time moving with Earth's orbit of the Sun? I understand that the Earth/Moon both have the same accelerations caused by the Sun's gravity, but accelerations are not additive - only forces. At any time, the moon will be pulled by...

Homework Statement Hi, I know that this probably is easy to calculate, but I have the ability to thing the opposite about problems, therefore I'm stuck with this one. The question is Determine the number of times the magnetic field has wound around the Sun by a heliocentric distance of 70...

Hi there, I have a question regarding the life cycle of a star. I know that when entering the red giant phase of a star's life, its radius/overall size will increase dramatically, but I was wondering if there's a basic way to determine the factor it will grow by during this process. I've seen...

...so close to the Sun's position? Is this even possible? First two, taken around May 1st, 2015. Last one, taken in October, 2015

i calculated the centripetal forces in our solar system but i can't seem to find a connection using the centripetal force formula: Fmpz=(m⋅v2)/r i found out that the mean centripetal force for the planets around the sun is about 10^39, the mean centripetal of the moons around Jupiter is about...

Hydrogen fusion as described by proton-proton chain reaction that dominates in the sun produces two positrons for each helium nucleus produced. These annihilate with free electrons while the number of protons remain the same. Over time the sun is supposed to become positively charged, yet the...

Dear PF Forum, Lunar Satelite orbits the moon, The moon orbits the earth, The Earth orbits the sun, I know that some of you know about this picture You might want to tell me. "No Steven, the Sun also orbits the earth" But for all practical purpose, we'd say that the earth orbits the sun. So...

Homework Statement Hey! I have trouble with an exercise that I need help with. Here it is: The magnetic field lines for the average interplanetary magnetic field (IMF) follow Archimedean spirals. i) Find the heliocentric distance r in Astronomical Units (AU), where a field line has wrapped...

Why do venus take more number of days for one complete rotation around sun than Earth when the gravitational pull towards venus is higher than Earth ?

Homework Statement THe sun has a mass of 1.99x10*30 kg. Jupiter has a mass of 1.90x10*27 kg and a mean radius of orbit around the sun of 7.78x10*8 km what is the speed that Jupiter travels in its orbit around the sun? Homework Equations fg=(Gm1m2)/d*2 fc=(4pie*2mr)/T*2 The Attempt at a...

The following phenomenon was posted on a discussion group forum to which I subscribe. The link below is to a UTube video that seems to show a very strange sunrise/sunset (not sure which it is). >>>Assuming this whole thing is not a photoshop fraud (which it may very well be)<<<, then is there...

Does an object falling into the sun reach approximately the speed of light?

I've written a java program to model the solar system. All my planets move in very well defined, stable orbits. The sun, on the other hand, is doing some very weird stuff. I've attached a plot of its path, a very zoomed in and a very zoomed out one. It isn't spiralling gradually inwards or...

Find the point between the sun and the Earth where the gravitational force on an object is equal to zero I know the mass of the sun is 1.989 x 10^30 kg G = 6.67 x 10^-11 The distance between the two is 1.49604618 x 10^11 The mass of the Earth is 5.962 * 10^24 I have the equation F =...

On Wolfram Alpha, I get the following values for gravitational acceleration on Earth due to the sun and moon, respectively: gravitational constant * mass of sun / (distance to sun)^2 → 0.005991 m/s2 gravitational constant * mass of moon / (distance to moon)^2 → 3.68×10-5 m/s2 If the...

As I understand it a coordinate origin is just chosen for convenience. So how can we state the Earth revolves around the sun when you could make coordinate origin at any point in the universe??

1. Compute the Larmor radius for a typical electron in the K corona.2. , , m=9.11×10-31 kg, q=1.602×10-19 CThe Attempt at a Solution My problem is I don't know where to find the other two values that correspond specifically to the the K corona. Then it becomes a simple plug-and-chug problem...

Homework Statement An asteroid is knocked out of the Kuiper belt and starts to fall toward the sun. (Assume it's initial potential energy and kinetic energy is 0.) a. Write down the differential equation for r(t) giving the position of the asteroid as a function of time. b. Solve the...

I want to know that if we double the mass of the planets and our sun in the solar system,then will it make any difference in the orbits of the planets?will it be necessary to double the distance of each planet from sun?(I am asking it assuming that the sun on doubling of its mass,don't turn into...

Hey all, I think that I'm doing this problem correctly but I'm getting an answer that's a couple thousand Kelvins off. Sorry if I should have posted this in the "advanced" section. 1. Homework Statement Part of a flat region of Pluto has the Sun directly overhead. Its surface temperature is 58...

When I observe the sunset from my balcony, the sun appears far away near the horizon. But when I watch sunset at a beach the sun appears closer to me at the horizon. Why so?

Hi, I am wondering. Is it possible to predict the amount of time dilation on the surface of the sun compared to the surface of the earth? Is this a correct question to ask, or have I made a bad assumption? Thanks in advance. Ayjay

The sun has no surface, but it appears to have a surface. I may recall that Feynman said that the apparent diameter is equal to the mean free path of a photon. That could be, but I don't get the relationship. Any help?